Q: Which of the following is a correct formula for calculating total magnification in a light microscope?

$$\text{Total Magnification} = \text{ocular lens} \times \text{objective lens}$$

Question 1

Which of the following best describes the difference between magnification and resolution in microscopy?

Accepted Answer

Magnification refers to how much larger an object appears, while resolution refers to the ability to distinguish two points as separate.

Question 2

A student observes a cell under a light microscope at 400x total magnification. If the field of view (FOV) is 2 mm and 4 cells fit across the diameter, what is the approximate size of one cell in micrometres ($$\mu m$$)?

Accepted Answer

$$500\ \mu m$$

Question 3

Which microscope would be most appropriate to view the detailed internal structure of mitochondria?

Accepted Answer

Transmission Electron Microscope (TEM)

Question 4

Which of the following statements about the cell membrane is correct according to the fluid mosaic model?

Accepted Answer

It is composed of a phospholipid bilayer with proteins embedded throughout.

Question 5

A plant cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 6

Which organelle is responsible for packaging and sorting proteins for export from the cell?

Accepted Answer

Golgi apparatus

Question 7

Which of the following best explains why small cells are more efficient at exchanging materials with their environment than large cells?

Accepted Answer

Small cells have a larger surface area to volume ratio, allowing faster exchange of materials.

Question 8

Which process requires energy input from the cell to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 9

Which of the following is a function of lysosomes in animal cells?

Accepted Answer

Breaking down and recycling cellular waste

Question 10

Which of the following best describes the role of the nucleolus?

Accepted Answer

It produces ribosomes.

Question 11

Which of the following statements about mitochondria is correct?

Accepted Answer

They are the site of aerobic respiration and ATP production.

Question 12

Which of the following is a correct formula for calculating total magnification in a light microscope?

Accepted Answer

$$	ext{Total Magnification} = 	ext{ocular lens} 	imes 	ext{objective lens}$$

Question 13

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules across a membrane via protein channels or carriers, without energy input.

Question 14

Which organelle is responsible for the synthesis of lipids?

Accepted Answer

Smooth endoplasmic reticulum

Question 15

Which of the following is a similarity between prokaryotic and eukaryotic cells?

Accepted Answer

Both contain DNA.

Question 16

Which of the following statements about the function of the vacuole in plant cells is correct?

Accepted Answer

It helps maintain turgor pressure and stores substances.

Question 17

Which of the following best explains why electron microscopes have higher resolution than light microscopes?

Accepted Answer

Electrons have a much shorter wavelength than visible light, allowing finer details to be distinguished.

Question 18

Which of the following is a function of the cell wall in plant cells?

Accepted Answer

Providing structural support and protection.

Question 19

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water molecules from a region of high water concentration to low water concentration through a selectively permeable membrane.

Question 20

Which of the following best describes the function of ribosomes?

Accepted Answer

They are the site of protein synthesis.

Cell Structure, Function, and Microscopy: Foundations of Life

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